The original Lucid Puppy series ran from Puppy 5.00 - 5.29. Package compatibility across this range is good. Playdayz was the lead developer of Lucid.
The "revitalized" Lucid series consists of 5.2.8.6 and 5.2.8.7. RErwin is the maintainer of Lucid, following Playdayz' retirement from it.